<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>数组去重</title>
	</head>
	<body>
		<script>
			var arr=[1,2,2,3,4];
			var newArr=[];
			
			for(var i=0;i<arr.length;i++){
				var bool=true;
				for(var j=0;j<newArr.length;j++){
					if(arr[i]==newArr[j]){
						bool=false;
					}
				}
				if(bool){
					newArr[newArr.length]=arr[i];
				}
			}
			console.log(newArr);
		</script>
	</body>
</html>
